AC/heater box parts

Mr. Sinister said
I cant say yes because I have never seen the 68' type layout maybe some here can help us out.

yep, it will work. 67-72 will all interchange with a few minor issues. I bought a whole setup from a 71 dart & put in my 69 cuda. Firewall will need to be modified if it was a non ac car originally. I can give you some tips if you decide to do it